To open an new linked Object in the Navigator right-click and select"Open" or double click it with the left mouse button.
You can also edit a Text Image Link Object via right-click > "Edit" in the Navigator. A new editor opens. It shows two columns which are named "References in the Object" on the left and "Replace with" on the right. The left colum lists up the image and XML document which are component parts of the Text Image Link Object. With the buttons in the category "Add new Object(s)" on the right side you can add new Objects or local files to the right column. These Objects will replace the old ones in the left column. Otherwise you can remove Objects from the lists of both columns with the button "Remove selected Object". The position of a selected Object in the list can be changed via "Up" and "Down". All changes can be finally applied by "Apply changes...".